Fossil forms of Amentiferae
Jack A. Wolfe
1973, Brittonia (25) 334-355
Review of the procedures used in determining fossil plant organs indicates that the many Cretaceous records of extant genera of “Amentiferae” based on leaves should be rejected as theoretically unreliable. Palynological data, in combination with some valid megafossil data, indicate that most recognizable members of “Amentiferae” are no older than...
Oxidation during magmatic differentiation, Finnmarka Complex, Oslo area, Norway: Part 2, the mafic silicates
Gerald K. Czamanske, David R. Wones
1973, Journal of Petrology (14) 349-380
Electron-microprobe analyses are presented for pyroxene, amphibole, and biotite from monzonite, granodiorite, and granite at Finnmarka, Norway. Compositional trends measured in biotite, present in all three rock types, and in amphibole, present in the monzonite and granodiorite, are markedly atypical and are interpreted as reflecting crystallization under progressively more...
Bidding and production relationships for federal OCS leases: Statistical studies of wildcat leases, Gulf of Mexico, 1962, and prior sales
John Lohrenz, Hillary A. Oden
1973, Conference Paper
The relationships between bids received on wildcat leases issued on federal OCS lands in the Gulf of Mexico from 1954 through 1962 and subsequent drilling on, production from, and relinquishment of these leases were studied. The results provided quantitative answers to questions regarding bidding as prescribed by current laws and...
Shallow structure and geologic development of the Southern Red Sea
David A. Ross, John Schlee
1973, GSA Bulletin (84) 3827-3848
A series of 34 shallow-penetration seismic-reflection profiles made across the Red Sea show that it developed in two main stages. Initially, an early or pre-Miocene uplift and lateral extension resulted in crustal thinning and eventual formation of the main Red Sea Basin. During Miocene time, the Red Sea was isolated...
Surface jet stream excess temperature analysis
Daniel P. Bauer, Louis H. Motz
1973, Report
No abstract available....
Glauconites from New Jersey-Maryland coastal plain: Their K-Ar ages and application in stratigraphic studies
James P. Owens, Norman F. Sohl
1973, Geological Society of America Bulletin (84) 2811-2838
Glauconite samples from various stratigraphic levels in the northern Atlantic Coastal Plain were dated by the K-Ar method. Twenty-eight samples were collected from glauconite-bearing sands in four traverses across the outcrop belt of Upper Cretaceous–lower Tertiary formations from northern New Jersey to eastern Maryland, thus providing a framework on which...
Regional gravity anomalies and crustal structure in northern Colombia
J. E. Case, W.D. MacDonald
1973, Geological Society of America Bulletin (84) 2905-2916
The central range of the Colombian Andes gives way northward to a series of Cenozoic fault-bordered basins and uplifts near the Caribbean Sea. Pre-Cenozoic structures exposed in the uplifts curve increasingly toward the east to become parallel to the continental margins along the south side of the Caribbean. Major Cenozoic...
Tests of rhodamine WT dye for toxicity to oysters and fish
Garald G. Parker Jr.
1973, Journal of Research of the U.S. Geological Survey (1) 499-499
Because of the toxicity to oyster larvae and eggs of rhodamine B dye in concentrations greater than 1 mg/l in earlier tests, there was a concern that rhodamine WT, a similar tracer dye, would have a detrimental effect on marine life being developed under the aquaculture program of the Lummi...
Structure and development of the continental margin of British Honduras
William P. Dillon, John G. Vedder
1973, Geological Society of America Bulletin (84) 2713-2732
The continental margin of British Honduras is characterized by elongate ridges that are sub-parallel with the coast and that diverge slightly northward. Each ridge apparently is formed by aligned fault blocks composed of continental basement rock that rotated and subsided during rifting of the margin. The western part of the...
Eclogites from southwestern Oregon
Edward D. Ghent, Robert G. Coleman
1973, Geological Society of America Bulletin (84) 2471-2488
Eclogite, high-grade blueschist, and amphibolite blocks occur within the Mesozoic Otter Point Formation of southwestern Oregon and are inferred to have been tectonically emplaced by eastward-directed overthrusting involving Colebrooke Schist and serpentinite.Eclogite from southwestern Oregon is very similar in bulk chemistry and mineralogy to the well-studied eclogite of California.Calculations of...
Biotite as a source of some of the sulfur in porphyry copper deposits
Norman G. Banks
1973, Economic Geology (68) 697-703
No abstract available....
Alaska-Aleutian range batholith: Geochronology, chemistry, and relation to circum-Pacific plutonism
Bruce L. Reed, Marvin A. Lanphere
1973, GSA Bulletin (84) 2583-2610
Potassium-argon mineral ages and reconnaissance mapping of approximately 65,000 sq km in south-central Alaska indicate that the Mesozoic and Cenozoic plutonic rocks in the region were emplaced during three discrete intrusive epochs. Most of the plutonic rocks are part of the Alaska-Aleutian Range batholith; the remainder appear as outcrops in...
Aquifer diffusivity of the Ohio River alluvial aquifer by the flood-wave response method
Harold H. Zehner, Hayes F. Grubb
1973, Journal of Research of the U.S. Geological Survey (1) 597-601
Aquifer diffusivity (T/S) was calculated for 10 sites in the alluvial aquifer adjacent to the Ohio River by observing the response of the aquifer to a flood wave in the river. The calculated type curves matched the observed aquifer response reasonably well at eight of the 10 sites. The diffusivities ranged from 0.4 ft2...
Remote sensing of turbidity plumes in Lake Ontario
E.J. Pluhowski
1973, Journal of Research of the U.S. Geological Survey (1) 609-614
High-altitude photography provides an effective method of monitoring the spatial extent of turbidity plumes in Lake Ontario. Large plumes generated by the Niagara, Genesee, and Oswego Rivers are identifiable on photographs obtained from about 60,000 feet above the lake on July 6, 1970, October 19, 1970, and May 29, 1971. The Niagara plume, covering as...
Method for estimating the diversion potential of streams in eastern Massachusetts and southern Rhode Island
Gary D. Tasker
1973, Journal of Research of the U.S. Geological Survey (1) 615-619
A simple method is proposed for estimating the probable magnitude and frequency of streamflow that is in excess of predetermined minimum streamflows required downstream in eastern Massachusetts and southern Rhode Island. Regional curves relate these annual volumes of streamflow excess to the average annual discharge and the median 7-day annual minimum flow of the site....
The enthalpies of formation of nesquehonite, MgCO3 * 3H2O, and hydromagnesite, 5MgO * 4CO2 * 5H2O
Bruce S. Hemingway, Richard A. Robie
1973, Journal of Research of the U.S. Geological Survey (1) 543-547
The enthalpies of formation, ΔH°f, of nesquehonite, MgCO3 * 3H2O, and hydromagnesite, 5MgO * 4CO2 * 5H2O, have been determined by HCl solution calorimetry. For the reaction MgO(c) + CO2(g) + 3H2O(l) = MgCO2 * 3H2O(c), the enthalpy change at 298.15 K is -29,781*40 cal mor' . For the reaction 5MgO(c) +...
Bathymetry of the continental margin off Liberia, West Africa
John Schlee, James M. Robb, John C. Behrendt
1973, Journal of Research of the U.S. Geological Survey (1) 563-567
A bathymetric map based on new data allows examination of geomorphic features on the narrow continental margin off Liberia. The continental shelf in this region is relatively flat and featureless. The northwestern part of the continental slope, off Monrovia and Cape Mount, shows complex slump features and two submarine valleys. The central part of the...
Galkhaite, (Hg,Cu,Tl,Zn) (As,Sb)S2, from the Getchell mine, Humboldt County, Nevada
Theodore Botinelly, George J. Neuerburg, Nancy M. Conklin
1973, Journal of Research of the U.S. Geological Survey (1) 515-517
The first reported occurrence in the United States of galkhaite (Hg,Cu,Tl,Zn)(As,Sb)S2 is at the Getchell mine, Humboldt County, Nev. The mineral occurs as brownish-black cubes associated with graphite, pyrite, and realgar. In polished section galkhaite is grayish white and isotropic with a deep-red internal reflection; reflectivity at 590 nm is 21.6 percent. Spectrographic analysis gave...
Spectrophotometric determination of tungsten in rocks by an isotope dilution procedure
E.G. Lillie, L. Paul Greenland
1973, Journal of Research of the U.S. Geological Survey (1) 555-558
Samples are decomposed with hydrofluoric acid and perchloric acid in the presence of W181 tracer. Molybdenum is extracted from a hydrochloric acid solution with tributyl phosphate. Tungsten is separated from most other elements by extraction of the a-benzoinoximate into chloroform. Stannous chloride in concentrated hydrochloric acid is used to strip tungsten and reduce it to...
Chemical analysis of rutile - a pyrocatechol violet spectrophotometric procedure for the direct microdetermination of zirconium
Robert Meyrowitz
1973, Journal of Research of the U.S. Geological Survey (1) 549-554
The ZrO2 content of rutile is determined spectrophotometrically by a direct pyrocatechol violet procedure. The sample is decomposed by potassium pyrosulfate fusion in a transparent quartz crucible, and a sulfuric acid solution of the melt is used for the determination at a pH of 5.1. Of the elements commonly present in rutile, only titanium and niobium...
Changes in floodflow characteristics of a rectified channel caused by vegetation, Jackson, Mississippi
K. V. Wilson
1973, Journal of Research of the U.S. Geological Survey (1) 621-625
Extreme changes in velocity, stage, and Manning's roughness coefficient, n, were observed during the first year after canalization of Hanging Moss Creek at Jackson, Miss. Additional changes were observed during the following 8 years. The channel, constructed during the summer of 1963, had a 50-foot-wide bottom, 2:1 side slopes, and 12-foot depth. In March 1964,...
A study of the distribution of the polychlorinated biphenyls in the aquatic environment
Hans J. Crump-Wiesner, Herman R. Feltz, Marvin L. Yates
1973, Journal of Research of the U.S. Geological Survey (1) 603-607
Data gathered from monitoring activities and project studies indicate the ubiquitous occurrence and distribution of polychlorinated biphenyls in the aquatic environment. Residues have been detected in samples from 19 States, representing nearly every region of the country. Concentrations ranged from 0.1 to 4.0 ug/l in unfiltered water samples and 5.0 to 3,200 ug/kg in bottom...
Ice ages and the thermal equilibrium of the earth
David P. Adam
1973, Journal of Research of the U.S. Geological Survey (1) 587-596
A model for climatic change, and particularly for the changes of the late Cenozoic, involves as its primary variables the albedo of the earth and the heat storage characteristics of the oceans. Geography exerts a strong influence. The model proposed does not require metaphysical causes or astronomical events other than known variations in the earth's...
Permian paleogeography of the Arctic
J. Thomas Dutro Jr., R. Birute Saldukas
1973, Journal of Research of the U.S. Geological Survey (1) 501-507
Three large land areas were dominant in the Arctic during the Permian: Fennoscandia, central and southern Siberia (Angara), and Canada. Smaller landmasses were in China, the Seward-Chukotskiy region, northern and eastern Siberia, and near Alaska. Coal deposits and strata bearing land plants covered a large area in central Siberia; saline basins containing red beds formed...
Pliocene marine fossils in the Paso Robles Formation, California
Warren O. Addicott, Jon S. Galehouse
1973, Journal of Research of the U.S. Geological Survey (1) 509-514
Marine invertebrates from the Paso Robles Formation recently discovered near Atascadero, Calif., indicate that the basal part of this chiefly nonmarine deposit is of provincial early Pliocene age. Heretofore the lack of direct fossil or radiometric evidence of the age of the Paso Robles has made it a difficult unit to place in the...
